oppsi popsi oppsi popsi pposi pposi opspi pospi osppi soppi psopi spopi opspi pospi osppi soppi psopi spopi ppsoi ppsoi pspoi sppoi pspoi sppoi oppis popis oppis popis ppois ppois opips poips oipps iopps piops ipops opips poips oipps iopps piops ipops ppios ppios pipos ippos pipos ippos opsip posip ospip sopip psoip spoip opisp poisp oipsp iopsp piosp iposp osipp soipp oispp iospp siopp isopp psiop spiop pisop ipsop sipop ispop opsip posip ospip sopip psoip spoip opisp poisp oipsp iopsp piosp iposp osipp soipp oispp iospp siopp isopp psiop spiop pisop ipsop sipop ispop ppsio ppsio pspio sppio pspio sppio ppiso ppiso pipso ippso pipso ippso psipo spipo pispo ipspo sippo isppo psipo spipo pispo ipspo sippo isppo
Note: these 'words' (valid or invalid) are all the permutations of the word oppsi. These words are obtained by scrambling the letters in oppsi.